No image to display even for Last uploads means no files in the database.
The database is empty.
Open include/config.inc.php (not config.inc.php.sample)
I belive you know the name, the username of the database and the password of your coppermine database.
Insert them. Maybe during update was created a new empty database and now the values in config are the value of the empty one.
Usually the username and password are the user and pass for your host CPanel.
If you don't remeber the database name go in the host CPanel and click PHPMyAdmin to see the coppermine database name or click MySql databases or something like that to see the name and user.
MySql databases you can also change the password for the coppermine database if you don't remember it.
Ask your host to do it if you don't know anything about this kind of things so you won't ruin all.